class_docstr: Base class of learning rate scheduler.
docstr: Call to schedule current learning rate.
  
  Parameters
  ----------
  iteration: int
      Current iteration count.
docstr_tok: ["Call","to","schedule","current","learning","rate",".","Parameters","--","--","--","--","--","iteration",":","int","Current","iteration","count","."]
code: def __call__(self, iteration):
      """
      Call to schedule current learning rate.
  
      Parameters
      ----------
      iteration: int
          Current iteration count.
      """
      raise NotImplementedError("must override this")
  
file_path: mxnet/python/mxnet/misc.py
imports: import math
  import logging
label_desc: Use image node_id 2 for calling the LearningRateScheduler obj's underlying member method code with example usage: obj.__call__(iteration) without return types